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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eceee3f9ecf51ff366d9ef9ff51910cd7b414dead1e0c22d97b0b2bec824332' 
  AND token = 'TQjEsghU9G5MjeTZs8w9N+Zt60fkJR4mhyjqNQ2tjxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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