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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe87441ac51dc5fb9feffa27c6a3f4955d54e97b277b3b4354cce2433e6c30f1' 
  AND token = 'jaR0rK4Ft1Ia3Qu065t4OuEtH9G7/8HMdwcZT1r4bvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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