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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2611e8ec7537144a958e4d7b1f9ab88e8b4fed9dd8d91fe3d00fc4d0a5be7d81' 
  AND token = 'CS1wH3ovX47L1xIK7Lm56K5H3gyoxcXG0eEIVOwv0pc=' 
  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"
    }
  }
}