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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f63dc9c08ea0b2470403ff5a9aab620ae5fa9d2343270ce14fa08ec1dc9aa59' 
  AND token = 'uFHocfjBIN2TTF7nNwBLiDT7E4dMHchYKeUxgxM8Ysk=' 
  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"
    }
  }
}