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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59d24fab5ffe8c3a7e6a400b87d40288bf4142235b985ea4c0515868f0f3bfe9' 
  AND token = '2khOYfxbcqgBwpU+2k2F8ji8XgTazFEXswtiJ7SLKL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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