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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0138479d563cbdb56544a891a6fbc3357ef6b7dd62ee75ff27847702a8b8c5e6' 
  AND token = 'tMBZAUdRhOdSxAW97op31TE8mNSXqL/Dlj5K/0jnw80=' 
  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"
    }
  }
}