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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c39cbe65eb2d6e26631c1fd20f8430d90dda82c3c0de8a3c1b828cd45cb72a48' 
  AND token = 'nn54m2qlx0XeLFYp1cafgoPE26zMNYXfkKlTxApHV9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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