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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b54e21d935fa3925e72ebbb204eb26c11ee58fd7f356d6ca2d9d5f91e222c701' 
  AND token = 'iZWy8oChgkDlsk3KcNANVSkjQqX1NUij6ip1VMxM7Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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