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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '818cf97e26e021e04c2397732f7da4a472a00e4d77f5f587eaf5b7150bfd0393' 
  AND token = 'hEFna/GQbexXRPOBhWwVBwJWWhr6TrCJw47K4Bkfxhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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