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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddbd56d2f28c3696a8d4b12a468833e8bc9a31b6904b316b90eea367ecba7ed9' 
  AND token = 'n6hjl4i1pY7BsPF+MyWHw27J4Q3iuX23FJf/dBjYPW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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