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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9901104f04e7755927f1ae2146636a2c1a896f28c92a954db31d54946832167' 
  AND token = 'QT3X0hoaSyUlANCEqX10JYhhX8FMj3wf87whe1Q/cXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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