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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0883984d6ae8000c99e5b4136fb7bb8b80221c746313147c9bc0c1830ada75a' 
  AND token = 'KMwTdnTBwicxdgiTqi9UHFxJ7oFO7d334bVpPu0Q8LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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