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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25b3363d59358b5596dd926c9428bc28de8752cad2df2b5353d80e77735b0cff' 
  AND token = '0YYnBjVIXpEFdRJuJu5bGv3mSW1iIahIPW3uNvnkyeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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