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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0bd99cdd9c83bcda13a03210ce996882b6564fad5193c5a135de18d38e96e97' 
  AND token = '9Fmhf+9gGE5dDTlKfvN8B4RMRTsFgmEIJIa4OdlLdfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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