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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea5c5228d7d1d64130cbe5daa53c88d0db530a043b0316121059ec0c493245a7' 
  AND token = 'ouul/jRyiZ0dzEM0acDzH0/8qI7Dhuakp9VY4NQpokM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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