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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '851fb95d7082ec51443c7890d47c2f9631ff34bf4fb83b1f9e4bd40b2c19f48f' 
  AND token = 'o0aPK+fEahShjRpnjszK3VXgnNc9CwJ2W72Sk5Ppd+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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