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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60842367b51a42fd770faba03cb01187c63d8baa76565b1ce2e01f1ae80e46cc' 
  AND token = 'fdaZLrY8/YvCieXUSG2Fzt+94KbkAq9g6ML3Bo2IVqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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