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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9815ecb26d2d788c90ec47b04aac5afb4cdea0226c7555d5068f978a59b47d7e' 
  AND token = 'Nfjaq3M8x965S5qU4UDwQRbugWYoCezuSKPuysnmId4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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