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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27212730ff0a8574f0da6e07c5872e3403660241b9718ebf680ab33140e8a61a' 
  AND token = 'p+BcwhOaoN1gUDpVjnV/Pd7ZpIT6ZJl7kHMFfiMlCh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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