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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da4e140c73b43d21258dd91e56d64b90e215a624a00cefc2fdb9816ff519846f' 
  AND token = 'WiwHY1slIZ91w5Q1JeMfF9F7HbbQ4yvvx7jeaWgfxfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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