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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9faea30a70525cd11e6f4bdf45c927f1f43fbea387bb8b99bafae80fedb2beb1' 
  AND token = '3gMWvaQNOg6a912e58rv/7FF4fnapWwjGbrD/X+gBuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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