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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '474c79c267ffe73998d2d671c519095fa5792ed66ae583c0a209912b765f54b3' 
  AND token = '78tlqbXYtKo6ViuNQoOkpdh5rmF4PsoC0R5XkNyXocw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}