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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5877e9dac355cf3b3be22721028432488e13e09093674eadbb40ee21b651a3a0' 
  AND token = 'A+TfwbpkprzmLa02g3LFZ9VPi2L7ymfHtmRmYor7Atk=' 
  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"
    }
  }
}