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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c209020427830c95298b8ffa58d6e63a8e1f90d4fecda2755d4fdb6119e1ed4f' 
  AND token = '8VuSmf/TN3y3JwBIxlrXtWB2Vf6AXrrOJ4OfzQhZIDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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