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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aca3a38224bde3c7e64acab864d00ba1b7f2066c8699bd4aad8ba31c7c1cb30' 
  AND token = 'Ym39Cm/Psa7y25sqqlf8ZTt9h2xb6m9h5Pty9t6U3TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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