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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2551365beeea15b7074770e6f155dc42c6ef69ba01e096f21760d5b383203e44' 
  AND token = 'Hg5e7DTgIwyna+lofOfHKv0R2zcGj/HZ10BDu37ehaA=' 
  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"
    }
  }
}