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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41a38aa49c836efd06ee680a0c0966edd3e47d0764f0d0e8598c1b0e7e015774' 
  AND token = 'sNacyOSLap6Au/DW+X6MA6eQco9grkM8Nka9QftiiV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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