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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '866401bf96e27d9bab92de1879f7e91de9e2f20a6f08b3c555ed1c72ddee4587' 
  AND token = '7FVY/QI6lmJ+jEokmD9tWFRnIl0xWgXx59ufK3v/RiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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