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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6291985693d0c9dc51b7ca30178d81f8b0b8c245613ba2d0cfdce88669caba30' 
  AND token = 'm3hOGRKWLSFenOsa0xMENqIY4JU+W096BRD0G+xUIv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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