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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc608e06e88839cef7807a448c7a773b176a75dda4ce8c176c88f87a672ca389' 
  AND token = '0b/pSNDRKLHlMca/DuC5sR7oJkZardp+vXSQqbEnQuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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