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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7ef6745a33b64bdd8dcfbcfbdd8499bd64d9f1e900936e14fb32b0a56b574d' 
  AND token = 'M4lR02+IgdX9/KqFB3k44hFqB6933VuQQFxdM4xRqyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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