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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da03c901e4ce5ed3c9f27f9444e9147357c16a32a426cbee0f40acd42491bdf' 
  AND token = 'WRqGepmf4DtH1X9a4jQoRMOAB9FdQHE5PQfxCMdmOFg=' 
  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"
    }
  }
}