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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0666f755d1c8dc8c7ec2f4fa9f20ffa2f453270c0d04762b8fedabd7e1c1c0c2' 
  AND token = '+CGaY97cISwV9TopXSQ3KSPXbFiNatCfsdTZM2tQ5EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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