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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3631df05f00da7a2e889bd4c1b778a5a7768cbb4b500c57290ef890a0075a253' 
  AND token = 'qk2GPxQ2aCl65cUkBgvaGm/P7hjAvyIU88MJM79lzig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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