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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a56558e037108313f3615547bc744994f6a97854b6ad88b3ce2df0208e61a29' 
  AND token = 'Qoasj2pa8pu+OfPv7gtJI61WAZG5Sj85+zjkxtwe6mM=' 
  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"
    }
  }
}