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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d14cdd4fd4481dce0a89a04e7c8c66a20efc9a076536271feef5354a99f6bc2' 
  AND token = 'cSzIGm+JI3qYwUIbkD4U8i/MNoeHc4EmfYm/PKjzQSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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