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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a7a2cf0e8c7353594b9d36fa6efd30df3e568539f783f4b3a2fce89fe5e187b' 
  AND token = 'ApAsObbA9QuowRyb3yFGDWYmvMiDK/46kFAYge0tB/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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