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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7175a7f99290a77e7b078188d95bc46c9f4b6ccbd5c195ea8c2865f839c43ea' 
  AND token = 'rEOiFKipghEuhZae9wkLMarYFsE7obDi44iHjBJtcZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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