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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b09928670b9cd1802ca5a9ee1ff66d694fd68db35ca0a022141d553a42dc545' 
  AND token = 'TXV4xktGfoJez2wzqiSNUXy6n6oUqtzUoNLm1sTzOR0=' 
  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"
    }
  }
}