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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c8e9829f914a0af252d486c8175ca4154cbb79e697a61aed8c481bf8050448a' 
  AND token = 'jY4PFoq4pAzwK1ZjcoNlHf7QO3H57W/Ic4em1s5y4kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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