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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84baf5ee74e0d650c3bea30c23e3bf322c9b752a645ec0bfa7b352b60265c9d1' 
  AND token = 'U4EWnkO2ldaOMGZR9DZeNdS7y+m9K+op1MPYRtKg6mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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