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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b12426f27d356da4761572875cadc6749b708cb7b7c6d4f224d9a1529e57f6d9' 
  AND token = 'j3xobrxSNE5/iF/X7nvQbDLbMzgZhnyav4RpCqEDWbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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