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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b2865b5c79064979cb5aee4a2dc3056310d3ef1cb9f446d24c9c8bc06342c2' 
  AND token = 'a2+qYPfc5YC3zNziksm52akRpNhNpST8Gv5G4uq0gn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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