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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc35ba7ad71c17c74475aa3ce8234ca121e3d66fe864f2ed29b01685c380c261' 
  AND token = 'aiyJc6Jz5JI5PpRuZ2syDDz7eXWaP3Dcz8XaaFPtePg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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