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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f438aca74063a2ced50dd3a89b678f45961418baf90d473c511547d9387db3c9' 
  AND token = 'qOfKbGFhdFHP0ayX/TiMx2xVeVJKlS1AUQDb393wkVU=' 
  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"
    }
  }
}