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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a82de79e3c6f75181dde2b60ba7dd5164750e9c06b21cd706c280d89c62f0d' 
  AND token = 'BSV180t+Bm7XL9B5OyJu6jlFb/3zQ6ihgOrtA67LKko=' 
  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"
    }
  }
}