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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e61e992e4c48357849898bdfabf1bc2308c452d0ca58bc0a3339ba295945c0' 
  AND token = '5ly1j5pcDOoUKdd8eTD0STS5llrsp9g/wQKZeZPgFhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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